<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button>点击</button>
    <p>abc</p>
    <script>
    // document.write(); 在文档中写入一个标签 
        console.log(document.write('<div>213</div>'));
    // element.innerHtml();
        console.log(document.innerHtml());
    document.createElement();
    </script>
</body>
</html>